Setting initial size of an object when added to a scene
You have added a new object (for example, a cube) and first of all, expand the properties menu of the new object, as in the picture.


Please note that this menu is displayed once, when adding an object,
if you have done something with the object, then this menu is no
longer available.

In this case, you can &quot;Apply&quot; changes (object -&gt; apply -&gt; scale / or location / or rotation)